bool is_inode_exist(struct lhdfs_ctrl *ctrl)
{
	if (0 != ctrl->lfs_im.lfs_inum) {
		printf("Inode number intial error!\n We now just have one file!\n");
		return false;	
	} else if (0 == ctrl->lfs_im.lfs_id) {
		printf("There is no inode!\n");
		return false;	
	} else 
		return true;
}	
